Dresden 2003 – wissenschaftliches Programm
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DF: Dielektrische Festkörper
DF 9: Phasenüberg
änge und Spektroskopie
DF 9.6: Vortrag
Donnerstag, 27. März 2003, 16:50–17:10, HSZ/403
NMR and acoustic studies of the melting-freezing phase transition of gallium in Vycor glass — •D. Michel1, E. V. Charnaya2, B. F. Borisov2, D. Yaskov2, C. Tien3, and Yu. A. Kumzerov4 — 1Faculty of Physics and Geosciences, University of Leipzig,04103 Leipzig, Germany — 2Institute of Physics, St.Petersburg State University, St.Petersburg, 198904, Russia — 3Department of Physics, National Cheng Kung University, Tainan,701 Taiwan — 4A. F. Ioffe Physico-Technical Institute RAS, St.Petersburg, 194021, Russia
The melting-freezing phase transition of gallium confined within Vycor glass was studied by NMR and acoustic techniques. A depression of the freezing and melting phase transition temperatures and a pronounced hysteresis in the melting-freezing processes were found and discussed. NMR studies on liquid confined gallium revealed a noticeable decrease in the Knight shift and a drastic acceleration in gallium spin-lattice relaxation.These changes depend on the size and the geometry of the pores. The relaxation measurements were used to estimate the thermal correlation times of the Ga atoms in the confined geometry and to relate them with atomic diffusion.